> > Aten't there anenometers that work like this? With a  
> oversize cup and 
> > a reference marker they can determine wind direction from 
> the velocity 
> > variations.
> 
> There is one, the Rotavecta Wind Transducer from Raymarine 
> (formerly Raytheon Marine Division), I believe it is patented.


It's not a bug, it's a design feature!  Imagine being in on that meeting.  

"So, your new anenometer is crap, the bearing are dodgy & the cups have poor
tolerances."
"Err... since the wobbles are consistant, we figure it'll measure wind
direction."
"Hmmm, brilliant - quick, to the patent office!"

Tony

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist